SINGAPORE, Dec 31 (Reuters) - After surging to a record in 2011, Singapore loan volume slid 19 percent in 2012 to US$33 billion via 93 deals, according to Thomson Reuters LPC. But several jumbo Singapore dollar deals and a slew of commodity borrowers returning for U.S. dollars helped make it the second-highest volume ever. First-half volume was bolstered by two Singapore dollar mega deals -- the S$5 billion (US$4.1 billion) self-arranged property development loan for M+S, and Marina Bay Sands' S$5.1 billion refinancing. The second half was supported mainly by commodity and energy names, while real estate borrowers were active throughout the year. Club loans continued to dominate, making up nearly half the total volume. Many of the sizeable deals were clubbed -- including the M+S loan, YTL PowerSeraya's S$2.6 billion refinancing, and Senoko Energy's S$1.075 billion refinanc...